Receive the latest entertainment-news updates in your inbox

Four months after getting legally married to Nicole Johnson, Michael Phelps celebrated again, this time in Mexico.

The 23-time Olympic gold medalist shared an Instagram photo Sunday of him walking down the aisle with the former Miss California USA, captioned, "My best friend.... I love you!!" Johnson also shared a picture of her walking with Phelps on a beach while dressed in a wedding gown.